Volume controls: A volume up/down dial is on the side of the audio controls. Simply scroll it up or down to your preference.

You can also adjust your headset audio and mic monitoring by going to Settings and selecting Devices & Accessories. Select your controller and then select the audio option you want to use.

Mute: The mute button is a slider button on the front of the audio controls. Slide it down to mute, and you will see an orange colour on the controls. Slide it up to unmute, and you will see a green colour on the controls.